Derbyshire's premier anti-snap and anti-bump high security UPVC door lock replacement service. We are a family run business founded in 2012 covering the whole of Derbyshire, we specialise in fitting Avocet ABS MK3 high security Euro profile cylinder UPVC door locks. Avocet ABS MK3 door locks offer the ultimate protection against lock snapping and lock bumping of Euro profile cylinder UPVC door locks. Low-Cost Snap Secured Locks Our mission is to educate the general public about the growing problem of lock snapping and lock bumping of standard Euro profile cylinder door locks and to offer a low cost snap secured solution to it.